When you ask "What number is halfway between 40 and 219?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=40 and Y=219.
To find the number halfway between 40 and 219, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 40 and 219 into our formula, we get:
(40 + 219)/2 = 129.5
Thus, the number halfway between 40 and 219 is 129.5.
To check that our answer is correct, we subtract 40 from 129.5 and subtract 129.5 from 219 and compare the two numbers:
129.5 - 40 = 89.5
219 - 129.5 = 89.5
As you can see, the halfway number is 89.5 higher than 40 and 89.5 lower than 219. Therefore, our halfway between answer of 129.5 above is correct.
Halfway Between
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Halfway Between 40 and 220
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